Those of you who have taken a class with me (Mr. John) would recognize my trusty coffee mug that often appears in the class videos.
As it is important to stay hydrated, I also have a bottle of water with me at my desk most of the day. The bottle is pictured below, filled to the top with water, next to a ruler for a sense of scale. (Click on the image to download a full size version.)
Your challenge this week is to guess the weight of the bottle filled with water in grams.
Share your answer and reasoning below and we'll announce the person who got closest to the actual weight next Friday when we launch part 2 of the estimation challenge.